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that is already melting down used plutonium. the white house is warning u.s. citizens to stay at least 50 miles away from that site, far more than the 20 miles japan is recommending. and millions have minimal food and water and are living in snowy and rainy conditions. more than 4300 are confirmed dead but officials believe that number will jump above 10,000. >>> another day of talk about a nuclear meltdown has touched off debate about radiation levels. now, most health experts agree that we have little to fear. simon perez has more on how people are exposed to radiation in their life every day. simon. >> reporter: dana, a lot of people are concerned about what is happening in japan and whether it could actually cross the pacific ocean and get here to california and the united states. but the fact of the matter is radiation is already here as you said exposed to it every day as you say. >> there is no way to avoid it. it is very small amounts. >> reporter: this radiation biologist says exposure comes from a variety of sources. >> flying in an airplane. increased radiation because of the altitud
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